Round mini louvers are primarily designed to fill bird block ventilation holes in wood rafters. Round mini louvers provide air flow in to the attic while preventing large insects and small birds from entering. They are easy to install by lightly tapping in. The installation avoids damage to painted areas from vapor and frost. Mini louvers can help protect against intrusion of burning embers through the ventilation openings.
- Used to prevent attic access for birds or large insect while maximizing intake airflow to the attic
- Overall size 3.5 in. diameter
- Fits 3-in diameter holes
- 1.34 Square inch net free area












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